#13021: Inaccessible RHS warning is confusing for users -------------------------------------+------------------------------------- Reporter: mpickering | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.1 Resolution: | Keywords: | PatternMatchWarnings Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): The `COMPLETE` pragma is an assertion that writing a function which matches on each of the constructors in the set is total. In this example, for this to be true, there can be no `A` values as if there were, no function just matching on `B` would be total. Thus, the warning about the inaccessible RHS is correct wrt the assertion made by the programmer. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13021#comment:8 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler